Si no encuentras el recogedor, mira detrás de la puerta, al lado de la escoba.

Because they are two different words:

• si = if
• sí = yes or himself / herself / itself in some contexts

So in Si no encuentras el recogedor..., si introduces a condition: If you can’t find the dustpan...

The accent mark changes the meaning.

The verb is encontrar (to find), and it has a stem change in the present tense:

• encuentro
• encuentras
• encuentra
• encontramos
• encontráis
• encuentran

The o in the stem changes to ue in most forms. That is why you get encuentras.

Here it means you find or, in this sentence, you can find depending on the English translation.

Spanish often leaves out subject pronouns when they are clear from the verb form.

• encuentras already tells you the subject is tú
• mira is the tú imperative form

So Si no encuentras... naturally means If you don’t find... or If you can’t find..., with you understood.

You could say Si tú no encuentras el recogedor..., but that usually adds emphasis or contrast.

Mira is the informal singular command form of mirar (to look).

So:

• mira = look
• mire = formal singular command
• mirad = informal plural command in Spain
• miren = formal/plural command in Latin America and also formal plural

In this sentence, the speaker is telling one person, informally, where to look:

If you don’t find the dustpan, look behind the door...

Because mira is not part of the if clause. It is the main command.

The sentence has two parts:

1. Si no encuentras el recogedor = If you don’t find the dustpan
2. mira detrás de la puerta... = look behind the door...

After si in a normal real condition, Spanish usually uses the present indicative, not the subjunctive:

• Si no encuentras... = correct
• Si no encuentres... = not correct here

Then the result or instruction can be a command:

• Si no encuentras el recogedor, mira...

In Spain, el recogedor usually means a dustpan.

It comes from the idea of collecting/picking up dirt from the floor. It is commonly used together with la escoba (the broom).

Depending on the country, other words may also be used for this object, but recogedor is very normal in Spain.

Spanish uses definite articles more often than English.

Here, the articles sound natural because the speaker is referring to specific, identifiable things:

• el recogedor = the dustpan
• la puerta = the door
• la escoba = the broom

Even when English might sometimes sound okay without an article in certain contexts, Spanish often prefers one.

Also, every noun in Spanish has grammatical gender:

• el recogedor is masculine
• la puerta is feminine
• la escoba is feminine

Because detrás normally needs the preposition de before a noun.

So you say:

• detrás de la puerta = behind the door
• delante de la casa = in front of the house
• encima de la mesa = on top of the table

This is just how the structure works in Spanish. You cannot usually drop the de.

Because al is the contraction of a + el.

So:

• a + el = al
• de + el = del

The full expression is al lado de, which means next to / beside.

Literally, it is something like at the side of, but in normal English you would translate it as:

• next to the broom
• beside the broom

You cannot say a lado de la escoba here; al lado de is the correct fixed expression.

Because the speaker is narrowing down the location step by step.

• detrás de la puerta tells you the general place: behind the door
• al lado de la escoba gives a more precise detail: next to the broom

Spanish often stacks location phrases like this, just as English does:

• behind the door
• next to the broom

Together, they make the location more exact.

It can often feel like look, check, or have a look, depending on context.

In a sentence like this, natural English might be:

• look behind the door
• check behind the door
• have a look behind the door

So while the basic verb is mirar = to look, the most natural translation in context may vary.

Yes, but it changes the nuance slightly.

• mira detrás de la puerta = look behind the door
• busca detrás de la puerta = look for it behind the door / search behind the door

Mirar focuses on directing your eyes or attention. Buscar focuses more on searching for something.

In this sentence, mira sounds very natural because the speaker is pointing out a likely location.

The comma separates the if clause from the main clause:

• Si no encuentras el recogedor, = conditional part
• mira detrás de la puerta... = main instruction

This is very similar to English:

• If you can’t find the dustpan, look behind the door...

The second comma, before al lado de la escoba, separates an extra location detail. It helps readability and rhythm.

Yes, some variation is possible, but the original order is very natural.

For example:

• Si no encuentras el recogedor, mira al lado de la escoba, detrás de la puerta.
• Mira detrás de la puerta, al lado de la escoba, si no encuentras el recogedor.

These are possible, but the original sentence sounds clearer and more natural because it gives:

1. the condition first
2. then the instruction
3. then the location details in a logical order

So the given version is a good, natural model.